Question

12Q. Calculate the force exerted by the brakes on the motorcar which is moving with a velocity of 72 km/h and takes 5 s to stop after the application of brakes. Mass of the motorcar along with the passengers is 800 kg.
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Answer 1

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→ $U=72km/hr$

      $=20m/s$

→ $V=0 m/s$

→ $T=5 s$

⇒ $a=\frac{v-u}{t}$

      $=\frac{0-20}{5}= 4ms^{-2}$

Here, the - sign indicates that the body is retarding.

⇒ $Mass=800kg$

⇒  $Force=Mass$ ×$Acceleration$

               $=800$ × $4$

               $=3200 N$

Therefore , the force applied by the brakes is 3200 N.

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Hope it Helps !!

Answer 2

Answer:

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